sinding-larsen



A. SINDING-LARSEN. METHOD AND MEANS FOR THE UTILIZATION OF THE THERMICEFFECT OF CATHODE RAYS.

, APPLICATION FILED OCT. 30 I918.

Patented Dec. 30, 1919.

2 SHEETS-SHEET I.

4 A. SINDING-LARSEN. METHOD AND MEANS FOR THE UTILIZATION OF THE THERMICEFFECT OF CA APPLICATION FILED ocr so. 191s.

THODE RAYS.

1,326,794. Patented vDec. 30,1919.

2 SHEETS-SHEET 2.

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ALF SIINDING-LARSEN, OF VESTRE AKER, NEAR CHRISTIANIA, NORWAY.

METHOD AND MEANS FOR, THE UTILIZATION OF THE THERMI C EFFECT OF GATHODILRAYS.

Specification of Letters latent. Pate t d D643. 3% 1919 Applicationfiled October 80, 1918. Serial No. 260,407.

ments in Methods and Means for the Utilization of the Thermic Effect ofCathode-Rays; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to letters orfigures of reference marked thereon,

which form a part of this specification.

This invention has for its object a method as well as means for theutilization of the thermic efiect of cathode rays.

According to the present invention an effi cient utilization of thethermic effect of cathode rays is obtained by means of collecting therays by some known means so as to form a narrow pencil of a greater orless extension.

The object of this arrangement is not only to produce a concentratedaction of the thermal power of the rays, but more particularly to allowof passing the rays from the comparatively wide space in which thecathode is arranged through a narrow opening to the space where the heatis to be uti-' a crucible.

lized for instance for the purpose of heating This arrangement enablesthe object to be heated of being placed in a compartment, which isefficiently insulated against loss of heat by radiation, so thatsubstantially all the heat produced by the rays is taken up by theobject to be heated, while comparatively only a small quantity of .heatcan be given off by radiationthree cathods being provided. Each of thesaid cathodes is connected to its phase of the current. It is obvioushowever, that any other type of current may be used for carrying theinvention into effect.

In the drawings Figure 1 is a vertical section of a furnace, and Fig. 2is a horizontal section.

In the drawing A is the brickwork of the furnace inclosed in a casing B.In the top of the furnace is centrally arranged a heating compartment E,in which a crucible may forinstance be placed. The compartment is closedby means of a block D, on which is placed a cover C.

The lower part of the furnace is divided by three partitions in threecompartments communicating with each other and inclose the electrodes G,which comprise concave plates carried at the end of insulatorsintroduced through the brickwork. in the axial direction of theelectrodes a narrow opening F is provided between the said heatingcompartment E and the electrode compartments, the concavity of theelectrode surfaces being sov adapted as to cause the rays to cross oneanother or focus just in this narrow opening. The rear surfaces of theelectrodes may be insulated and may be provided with cooling means. J isa tube with a mirror H inserted in the upper part of the brickwork.Through this tube the openings and their surroundings can be inspectedso that the cathodes may be adjusted if the rays happen not to projectexactly into the opening. N is a pipe with a valve 0, communicating witha large vacuum container, in which a vacuum maintained by means of apump. The vacuum container is of such large volume as to'compensate foraccidental evolutions of gas in the cathode compartments.

In the illustrated example and also when other alternating current ismade use of the electrodes alternately serve as cathodes and as anodes,special anodes being thus not 1. Method of utilizing the thermic effectrays, so as to produce a narrow pencil of rays passmgthe so condensedrays through a narrow opening .into a heat' insulating chamber forincloslng the object to be heated and causing the rays to at upon thesaid ob- Jct;

2. Apparatus for the utilization of the I thermic effect of cathode rayscomprising means for producing cathgde rays, means for thecollection ofthe rays so as to produce a narrow pencil of rays, a heat insulatingbody inclosing the object to be heated, a narrow-opening in this heatinsulating body and means to cause the pencil of rays to project throughthis narrow opening and on tothe object: to be heated.

nected to'a vacuum pump through a pipe in which is inserted a vacuumcontainer of such a volume as to allow of an instantaneous compensationfor 'accidental evolutions of 5. Apparatus for .the ut1l1zat1on ofcathode rays as defined in claim 2 in which the cathodes producing therays are constructed as concave mlrrors.

6. Apparatus constructed in accordance with claim 2 in which the back ofthe electrode is electrically insulated and provided with a coolingarrangement 7. Apparatus for the utilization of the thermic efi'ect'ofcathode rays, comprising ak furnace having an electrode chamber,

means in said chamber for focusing cathode rays, a melting chamberseparated from'the electrode chamber and connected thereto by asmalLdireot opening and said rays being focuse diin said opening.

Apparatus for the utilization of the thermic effect of cathode rays,comprising a furnace having a plurality .of connected chambers, means ineach chamber for focus ing cathode rays, a heating and melting chamberseparated from said connected chambers and having a direct openingconnecting said heating and melting chamber with each furnace chamber,the cathode rays being focused in said openings.

9. Apparatus for the utilization of the thermic efiect of cathode rays,comprising a furnace having a plurality of connected chambers, means ineach chamber for focusing cathode rays, a heating and melting chamberseparated from, said connected chambers and having a direct openingconnecting said heating and melting chamber with each furnace chamber,the cathoderays being focused in said openings, and means to maintainexhaustion chambers. I

10. The method of utilizing'vthe thermic efiI'ect of cathode rays, whichcomprises separately focusing the rays emanating from a plurality ofelectrodes through separate of the connected openings into a chambercontaining the ob-,

ject to be heated.

11. The method of utilizing the thermic effect of cathode rays, whichcomprises maintaining electrodes in'separate communicating exhaustedchambers and separately focusing the rays from each electrode through anarrow opening into a closed chamber containing the object to be heated.

12. The method of utilizing the ,thermic effect of cathode rays, whichcom rises focusing the cathode rays at a smal opening 1 in the heatingchamber, and heating an object in said chamber beyond the focus oftherays. 4

In testimony that I claim the foregoing as my invention, l. have signedmy name in presence of two subscribing witnesses.

' ALF SINDING-LARSEN.

. Witnesses:

. C. FABRICIUS HANsEN,

EMAR W. DIESERUD.

